139 lines
4.0 KiB
JavaScript
139 lines
4.0 KiB
JavaScript
/**
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* A splitter control.
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* Turns an existing HTML element into an horizontal splitter control.
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* @constructor Splitter
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* @param {Object} params Available parameters:
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* {Element} container HTML container representing
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* the splitter
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* {function} [change] Callback method called when
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* the splitter value has changed.
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* The callback is called with
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* the new value as parameter
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*/
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function Splitter (params) {
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if (!params || !params.container) {
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throw new Error('params.container undefined in Splitter constructor');
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}
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var me = this;
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JSONEditor.util.addEventListener(params.container, "mousedown", function (event) {
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me.onMouseDown(event);
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});
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this.container = params.container;
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this.onChange = (params.change) ? params.change : function () {};
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this.params = {};
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}
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/**
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* Handle mouse down event. Start dragging the splitter.
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* @param {Event} event
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* @private
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*/
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Splitter.prototype.onMouseDown = function (event) {
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var me = this;
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var leftButtonDown = event.which ? (event.which == 1) : (event.button == 1);
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if (!leftButtonDown) {
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return;
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}
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if (!this.params.mousedown) {
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this.params.mousedown = true;
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this.params.mousemove =
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JSONEditor.util.addEventListener(document, 'mousemove', function (event) {
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me.onMouseMove(event);
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});
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this.params.mouseup =
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JSONEditor.util.addEventListener(document, 'mouseup', function (event) {
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me.onMouseUp(event);
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});
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this.params.screenX = event.screenX;
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this.params.value = this.getValue();
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}
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JSONEditor.util.preventDefault(event);
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};
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/**
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* Handle on mouse move event. Used to drag the splitter
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* @param {Event} event
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* @private
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*/
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Splitter.prototype.onMouseMove = function (event) {
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var width = (window.innerWidth || document.body.offsetWidth ||
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document.documentElement.offsetWidth);
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var diff = event.screenX - this.params.screenX;
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var value = this.params.value + diff / width;
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value = this.setValue(value);
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this.onChange(value);
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JSONEditor.util.preventDefault(event);
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};
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/**
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* Handle on mouse up event
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* @param {Event} event
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* @private
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*/
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Splitter.prototype.onMouseUp = function (event) {
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if (this.params.mousedown) {
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JSONEditor.util.removeEventListener(document, 'mousemove', this.params.mousemove);
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JSONEditor.util.removeEventListener(document, 'mouseup', this.params.mouseup);
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this.params.mousemove = undefined;
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this.params.mouseup = undefined;
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this.params.mousedown = false;
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}
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JSONEditor.util.preventDefault(event);
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};
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/**
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* Set a value for the splitter (UI is not adjusted)
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* @param {Number} value A number between 0.1 and 0.9
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* @return {Number} value The stored value
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*/
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Splitter.prototype.setValue = function (value) {
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value = Number(value);
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if (value < 0.1) {
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value = 0.1;
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}
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if (value > 0.9) {
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value = 0.9;
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}
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this.value = value;
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try {
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localStorage['splitterValue'] = value;
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}
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catch (e) {
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console.log(e);
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}
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return value;
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};
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/**
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* Get the splitter value from local storage
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* @return {Number} value A value between 0.1 and 0.9
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*/
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Splitter.prototype.getValue = function () {
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var value = this.value;
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if (value == undefined) {
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// read from localStorage once
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try {
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if (localStorage['splitterValue'] != undefined) {
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value = Number(localStorage['splitterValue']); // read
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value = this.setValue(value); // verify and store
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}
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}
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catch (e) {
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console.log(e);
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}
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}
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if (value == undefined) {
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value = this.setValue(0.5);
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}
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return value;
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};
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